So will you need beta testers for that M4 prototype?

I work for a major university and I'm sure we'd be happy to help

I'm having an issue where the unused nozzle on my dual extruder M2 is damaging some prints. That is, the active nozzle will lay down a portion of a layer, z lift, and move to the next area within the same layer to lay down the next portion to continue; but the unused/inactive nozzle will strike and ...